Documentation: ABI: /sys/devices/system/cpu/cpuidle/

Document cpuidle sysfs attributes by reading code, Documentation/cpuidle/,
and git logs.

Cc: Venki Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 8cdda1c..968d8ba 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -101,6 +101,26 @@ Description:       CPU topology files that describe a logical CPU's relationship
                See Documentation/cputopology.txt for more information.
 
 
+What:          /sys/devices/system/cpu/cpuidle/current_driver
+               /sys/devices/system/cpu/cpuidle/current_governer_ro
+Date:          September 2007
+Contact:       Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description:   Discover cpuidle policy and mechanism
+
+               Various CPUs today support multiple idle levels that are
+               differentiated by varying exit latencies and power
+               consumption during idle.
+
+               Idle policy (governor) is differentiated from idle mechanism
+               (driver)
+
+               current_driver: displays current idle mechanism
+
+               current_governor_ro: displays current idle policy
+
+               See files in Documentation/cpuidle/ for more information.
+
+
 What:      /sys/devices/system/cpu/cpu*/cache/index*/cache_disable_X
 Date:      August 2008
 KernelVersion: 2.6.27